Just wanted to post an update on my setup for anyone who may be considering something similar. I have the following:

Wheels: 18x10 APEX ARC-8's, square (anthracite)

Tires: Grand Am Continental Challenge scrubs from Turner, 275/35-18

Spacers: 15mm TMS (front), 12.5mm TMS (rear)

Suspension: Ground Control conversion kit, lowered 1/2" all the way aroiund

Alignment: -2.6 Front, -1.97 Rear (0 toe at my shops recommendation)

First, there isn't any rubbing. Anywhere.

Second, GORGEOUS. (giant FAIL for the camera being left at home...)

Third, handling was spectacular. I'm fairly certain I took 3-4 seconds off my best time from last year. (secondary FAIL on my part for opting out of renting a transponder yesterday)

Fourth,

Edit: The photog that was out finally posted pics. Here's a link so you can see for yourselves... I don't have copyright to it, so it goes straight to his site & is watermarked.

no rubbing? good news. i have the same spacers and didnt want to have to remove and worry about different bolts for each setup. do the extended bolts that come with the tms spacers fit well on this wheel?
thx!

no rubbing? good news. i have the same spacers and didnt want to have to remove and worry about different bolts for each setup. do the extended bolts that come with the tms spacers fit well on this wheel?
thx!

Nope. I have studs installed (90mm), so I can't answer your question. I can tell you the rears only have 4-5 thread rotations, so 90mm studs are about the shortest I would go.

I hope this isn't a dumb question but I can't seem to find a good answer. My car came with 18s, 245/40 and 265/40. Going to a square setup with 275/35 is going to make the rear wheels 3% smaller, can this cause speedo and traction control issues?

I hope this isn't a dumb question but I can't seem to find a good answer. My car came with 18s, 245/40 and 265/40. Going to a square setup with 275/35 is going to make the rear wheels 3% smaller, can this cause speedo and traction control issues?

You will have zero problems. Countless people are already running this setup, and have been doing the same with numerous other BMW models. If there were an issue people would be talking about it.

@paintpro21 and folks who run NT-05s on track/street - question for you... looks like the NT-05s in 275/35/18 square setup are out of stock everywhere :-( ... Will a 265/35/18 setup work as a good compromise?

@paintpro21 and folks who run NT-05s on track/street - question for you... looks like the NT-05s in 275/35/18 square setup are out of stock everywhere :-( ... Will a 265/35/18 setup work as a good compromise?

-Answered your PM

I would not recommend a 265/35/18 on the 18x10's just because the 275's are not available. I would pick a different tire like:

There is a very small issue with the DSC being a little confused. In agressive street driving I'm feeling the DSC touch the inside rear brake lightly when the rear end has not broken loose. Maybe the change in offset or slight change in rolling diameter has the computer's little brain confused. In "normal" driving I don't notice it at all and when I autocross I'll turn the DSC off. I consider it a very minor problem for me, but if you like to track with the DSC on, then it could be unsettling.

There is a very small issue with the DSC being a little confused. In agressive street driving I'm feeling the DSC touch the inside rear brake lightly when the rear end has not broken loose. Maybe the change in offset or slight change in rolling diameter has the computer's little brain confused. In "normal" driving I don't notice it at all and when I autocross I'll turn the DSC off. I consider it a very minor problem for me, but if you like to track with the DSC on, then it could be unsettling.

There is a very small issue with the DSC being a little confused. In agressive street driving I'm feeling the DSC touch the inside rear brake lightly when the rear end has not broken loose. Maybe the change in offset or slight change in rolling diameter has the computer's little brain confused. In "normal" driving I don't notice it at all and when I autocross I'll turn the DSC off. I consider it a very minor problem for me, but if you like to track with the DSC on, then it could be unsettling.

Dave

With a square setup, the approximate 2% f/r stagger is eliminated, so I guess the computer will sense rear wheel spin a bit earlier (technically, it could be sensing slight spin constantly). I donít remember it on my E46 M3, but then I always turned off DSC on track. I would expect that result.